Term
What are the default layers that specific ports configured as on Catalyst switches?
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Definition
Catalyst 3550 and 4500 families use L2 interfaces by default, whereas 6500 families use L3 by default. All CatOS switches as L2 by default. Note, that this information may not be shown in a running or starting configuration.
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Term
What are the 3 different types for L3 interfaces that are supported on Catalyst multilayer switches?
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Definition
- Routed port - A pure L3 interface similar to a routed port on a Cisco IOS router - Switch virtual interface (SVI) - A virtual VLAN interface for inter-VLAN routing. In other words, SVIs are the virtual routed VLAN interfaces. - Bridge virtual interface (BVI) - A L3 virtual bridging interface. |
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Term
How do routed ports work on a multilayer switch?
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Definition
A routed port is a physical port that acts similar to port on a traditional router with L3 addresses configured. A routed port is not associated with a particular VLAN
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Term
How do switch virtual interfaces (SVI) work on a multilayer switch?
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Definition
Switch virtual interfaces are L3 interfaces that are configured on multilayer switches that are used for inter-VLAN routing. An SVI is a VLAN interface that is associated with only one VLAN-ID to enable routing capability on that VLAN.
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Term
What must be present before an SVI can be created on a switch?
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Definition
Before creating an SVI (VLAN) interface, make sure that that VLAN is present in the VLAN database.
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Term
How do bridge virtual interfaces (BVI) work on a multilayer switch?
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Definition
A bridge virtual interface is a L3 virtual interface that acts like a normal SVI to route packets across bridged or routed domains. These days, BVI is useful only for migrating bridged networks to routed networks.
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Term
What IOS command enables DHCP forwarding on multilayer switch?
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Definition
| ip helper-address ip-of-DHCP-server |
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Term
What type of UDP packets will a multilayer switch forward when using the ip helper-address command?
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Definition
The ip help-address command forwards DHCP, TFTP, DNS, Time, NetBIOS, name server, and BOOTP packets by default.
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Term
When using the ip helper-address command, what must be disabled on any outbound interface to prevent the translation of a directed broadcast to a physical one?
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Definition
Make sure the ip directed-broadcast is not configured on any outbound interface that the UDP broadcast packets need to traverse.
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Term
What IOS command specifies additional UDP broadcasts for forwarding by the router when configuring the ip helper-address interface command?
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Definition
| [no] ip forward-protocol udp udp_ports |
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